Intro; Supervisor's Foreword; Preface; Parts of this thesis have been published in the following journal articles; Acknowledgements; Contents; 1 Introduction; 1.1 Skyrmions and Chiral Spin Structures; 1.1.1 Skyrmions and Helical Structures; 1.1.2 Chiral Spin Fluctuations; 1.1.3 Partial Order State; 1.1.4 Other Chiral Spin Structures; 1.1.5 Current Induced Motion of Skyrmion; 1.2 Transport Properties in Chiral Magnets; 1.2.1 Anomalous Hall Effect; 1.2.2 Topological Hall Effect and Emergent Electric Field; 1.2.3 Nonlinear Nonreciprocal Transport Phenomena; 1.3 Basic Information of MnSi

1.4 Purpose of This ThesisReferences; 2 Experimental Method; 2.1 Fabrication of Thin Plate Devices; 2.2 Thin-Film Growth; 2.3 Magnetization and Transport Measurement; References; 3 Planar Hall Effect in MnSi; 3.1 Introduction; 3.2 Planar Hall Effect in MnSi; 3.3 Phenomenological Model of the Planar Hall Effect; 3.4 Planar Hall Effect in Thin Plate Samples; 3.5 Summary; References; 4 Electrical Magnetochiral Effect in MnSi; 4.1 Introducation; 4.2 Electrical Magnetochiral Effect in Paramagentic Phase and Partial Order Phase; 4.2.1 Experimental Setting for Detection of eMChE in MnSi

4.2.2 Electrical Magnetochiral Effect at Ambient Pressure4.2.3 Electrical Magnetochiral Effect at the Phase Boundary of the Equilibrium Skyrmion-Lattice States; 4.2.4 Electrical Magnetochiral Effect in Partial Order Phase; 4.3 Summary; References; 5 Current-Induced Dynamics of Skyrmion Strings Investigated by Nonreciprocal Hall Effect; 5.1 Introduction; 5.2 Second-Harmonic Hall Effect in Skyrmion String Phase; 5.3 Current-Induced Dynamics of Skyrmion Strings; 5.4 Summary; References; 6 Transport Properties and Stability of Skyrmions in MnSi Thin Films; 6.1 Introduction

6.2 Formation of In-Plane Skyrmions in MnSi Thin Films6.3 Stability of Two-Dimensional Skyrmions Investigated by Topological Hall Effect; 6.4 Summary; References; 7 Conclusion